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Contents of the issue
E.O. Paton Electric Welding Institute of the NAS of Ukraine. 11 Kazymyr Malevych Str., 03150, Kyiv.
Evaluation of residual strength and performance of pipelines with corrosion defects, found at flaw detection, envisages meeting the limiting state criteria, which correlate the properties of pipe material and actual geometry of the structure with service load system. One of the ways to lower the conservatism of the respective numerical analysis is to directly take into account the natural scatter of physico-mechanical properties of the material. This paper proposes the numerical approach to statistical analysis of the limiting state of pipelines with defects of local thinning of the wall, which is based on consideration of the natural spatial non-uniformity of material properties (such as yield limit, microfracture stress, initial concentration of nuclei porosity of plastic deformation, critical value of plastic deformation, etc.) within the finite-element description of simultaneous development of the stress-strain state and ductile subcritical damage, using Monte-Carlo method. It is shown that this approach is characterized by lower conservatism, compared to generally-accepted deterministic methods, which imply consideration of uniform material properties. Here, statistical analysis remains sufficiently accurate for solving the characteristic problems of technical diagnostics of high hazard facilities. 10 Ref., 2 Tabl., 7 Fig.
Keywords: pipeline, defect of corrosion loss of metal, limiting state, fracture probability, Monte-Carlo method, ductile fracture
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